Specifications
| Fuel | 2-D Diesel |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 25 kW |
| Oil capacity | 8.5 L |
| Voltage options | 12 V |
| Phase | I,3 |
| Power factor | 0.8 |
| Battery group | 31 |
| Battery cranking | 625 CCA |
| Battery voltage | 12 V |
| Battery quantity | 1 |
| Coolant capacity | 16.8 L |
Filters & service parts
model family| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | find | |||
| Fuel filter | — | 50 hr | find | ||
| Oil filter | — | 200 hr | find | ||
| Belt | — | find | |||
| Coolant | — | ||||
| Oil | — | 50 hr |
Compiled from this model's family documentation — may include parts for closely-related variants. Confirm the exact part for your serial number.
Common questions
What is the power rating of the Cummins/Onan DGAC?
The Cummins/Onan DGAC is rated 25 kW standby.
What engine does the Cummins/Onan DGAC use?
The Cummins/Onan DGAC is powered by the Cummins/Onan 6A3.4 engine.
What fuel does the Cummins/Onan DGAC use?
The Cummins/Onan DGAC runs on 2-D Diesel.
Troubleshooting
23Fault codes
| Code | Meaning | Remedy |
|---|---|---|
| FAULT 1 or FAULT 2 | The fault lamp lights. Engine shuts down immediately, engine runs for several seconds and then shuts down, or engine continues to run. | Engine gauges show oil pressure, engine temperature, and frequency (speed) are within normal limits. |
Symptoms & remedies
| Symptom | Remedy |
|---|---|
| PRE HI ENGINE TEMP lamp lights. Engine continues to operate. | 1. Green RUN lamp lights following engine start-up. 2. Indicates engine has begun to overheat and engine temperature has risen to approximately 202°F (94°C). If generator is powering non-critical and critical loads and cannot be shutdown, use the following: a. Reduce load if possible by turning off non-critical loads. b. Check air inlets and outlets and remove any obstructions to airflow. c. Open doors or windows in generator area to increase ventilation. If engine can be stopped, follow procedure in step 3. |
| HI ENG TEMP lamp lights. Engine shuts down. | 4. Indicates engine has overheated (engine temperature has risen above 222°F/106°C) or coolant level is low (sets with coolant level sensor). Allow engine to cool down completely before proceeding with the following checks: a. Check coolant level and replenish if low. Look for possible coolant leakage points and repair if necessary. b. Check for obstructions to cooling airflow and correct as necessary. c. Check for a slipping fan belt and tighten if loose. d. Reset control and restart after locating and correcting problem. Contact an authorized dealer or distributor if none of the above. |
| PRE LO OIL PRES lamp lights. Engine continues to operate. | 4. Indicates engine oil pressure has dropped to 20 psi (138 kPa). If generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow step 5 procedure. If engine can be stopped, follow procedures in step 5. |
| LO OIL PRES lamp lights. Engine shuts down. | 5. Indicates engine oil pressure has dropped to 14 psi (97 kPa). Check oil level, lines and filters. If oil system is okay but oil level is low, replenish. Reset control and restart. Contact an authorized dealer or distributor if oil pressure is not in the range of 30 to 55 psi (206 to 379 kPa). |
| OVERCRANK lamp lights and engine stops cranking. | 6. *12-Light Panel Only. Engine runs, shuts down, and LO OIL PRES lamp lights. |
| Engine runs and then shuts down, OVERSPEED lamp lights. | 7. *12-Light Panel Only. |
| SWITCH OFF lamp flashes. | 8. *12-Light Panel Only. |
| LO FUEL lamp lights. Engine continues to run. | 9. *12-Light Panel Only. |
| LO FUEL lamp lights. Engine shuts down and LO OIL PRES lamp lights. | 10. *12-Light Panel Only. |
| LO ENG TEMP lamp lights. Set is in standby mode but is not operating. | 11. (Lamp lights when engine coolant temperature is 70°F (21°C) or lower. Since the lamp goes out after the engine |
| Indicates possible fuel system problem. | A. Check for empty fuel tank, fuel leaks, or plugged fuel lines and correct as required. b. Check for dirty fuel filter and replace if necessary (see MAINTENANCE section). c. Check for dirty or plugged air filter and replace if necessary (see MAINTENANCE section). d. Refer to Step 5. e. Reset the control and restart after correcting the problem. Contact an authorized dealer or distributor for service if none of the above. |
| Indicates engine has exceeded normal operating speed. | Contact an authorized dealer or distributor for service. |
| Run/Stop/Remote switch is in the Stop position which will prevent automatic starting if an automatic transfer switch is used. | Move the Run/Stop/Remote switch to the Remote position for automatic starting. |
| Indicates diesel fuel supply is running low. | Check fuel supply and replenish as required. |
| Indicates engine has run out of fuel. | Check fuel level and replenish as required. |
| Indicates engine coolant heater is not operating or is not circulating coolant. | A. Coolant heater not connected to power supply. Check for blown fuse or disconnected heater cord and correct as required. b. Check for low coolant level and replenish if required. Look for possible coolant leakage points and repair as required. c. Contact an authorized dealer or distributor if none of the above. |
| The fault lamp lights but no fault exists. | The monitor board or a sensor may be at fault. Contact an authorized dealer or distributor for service. |
| Engine will not crank. | The monitor board or a sensor may be at fault. Contact an authorized dealer or distributor for service. |
| Engine starts from generator control panel but will not start automatically or from a remote panel. | A. Fault lamp on. Correct fault and reset contorl. b. Poor battery cable connections. Clean the battery cable terminals and tighten all connections. c. Discharged or defective battery. Recharge or replace the battery. d. Contact an authorized dealer or distributor for assistance if none of the above. |
| Remote circuit breaker is tripped. | Reset breaker and restart. Contact an authorized dealer or distributor if breaker trips after resetting. |
| NO AC output voltage. | Field breaker is tripped. Reset breaker. Contact an authorized dealer or distributor if voltage build up causes breaker to trip. |
| Green RUN lamp does not light following engine start-up. | Indicates possible Start/Disconnect relay failure. Contact an authorized dealer or distributor for assistance. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Parts
7| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 122-0712 | Oil Filter MDL4/6 ESN 5312 5968 and Up | Oil filter | PartsGeek kuduparts $11.00 | |
| 149-1802 | Fuel Filter Element MDL6 | Fuel filter | PartsGeek | |
| 149-2289 | Glow Plug MDL3, MDL4, MDL6 (12 Volt) | Glow plug | PartsGeek | |
| 333-0220 | Glow Plug MDL3, MDL4, MDL6 (12 Volt) | Glow plug | PartsGeek | |
| 511-0147-14 | Water Pump Belt MDL3, MDL4, MDL6 | Water pump belt | PartsGeek | |
| 934-0500 | 1 | Service part / kit | PartsGeek | |
| 960-0135 | Service part / kit | PartsGeek |
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Fuel consumption
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Prime | |||
| Standby |
Available documents
Parts manual — 0932-0112 Onan Post-Sale Literature Index (07-1998) (Cummins/Onan)Service manual — 934-0125 Onan DGAB DGAC DGAD DGAE Diesel Genset Operators manual (08-1990) (Cummins/Onan)